Dynamo-electric machine



(N0 Model.) I 2 Sheets-Sheet 1.

W. K. FREEMAN. DYNAMO ELECTRIC MACHINE.

No. 440,557. Patented Nov. 11, 1890'.

(N0 M0de1.-) 2 Sheets-Sheet 2. W. K. FREEMAN. DYNAMO ELECTRIC MACHINE.

No. 440,557. Patented'Nov. 11, 1890.

Wn- J E5555 I UNIT D STATES PATENT OFFICE.

\VALTER K. FREEMAN, OF BROOKLYN, NEW YORK, ASSIGNOR TO \VILLIAM S. IIADAIVAY, JR, TRUSTEE, OF BOSTON, MAS$ACHUSETTS DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 440,557, dated November 11, 1890.

Application filed September 20, 1890 Serial No. 365,673! (No model.)

To all whom it may concern:

Be it known that I, WALTER K. FREEMAN, a citizen of the United States, and a resident of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Dynamo-Electric Machines; and I do hereby declare the following to be afull and exact descriptionjof the same, which will enable others skilled in the art to which the invention appertains to make and use the same.

My invention consists in certain novel improvements in the construction of the main frame-work of a dynamo-electric machine, whereby strength, compactness, and ease of assemblage of parts are secured, and whereby, also, the machine proper is enabled to be easily adjusted or shifted upon its base when necessary without disturbing the latter, all as will be hereinafter described, and pointed out particularly in the claims at the close of this specification.

In the accompanying drawings, Figure 1 represents a perspective view of a dynamo embodying my invention, and Fig. 2 a similar view of the detached parts of the machine, illustrating the details of the invention.

Similar letters of reference in both figures represent the same parts.

In machines of this class it is necessary that the frame-work which is to support and carry the operative parts shall be substantially made and capable of being firmly put together, so that when the parts are assembled and the machine operated the parts will be mutually supporting and their proper relations preserved. It is not only desirable that the frame-work should be strong, but that it should consist of as few parts as possible, in order that it may be put together with facility and that the number of joints and bolts may be reduced to a minimum, due regard being had for the fact that the parts must be separated in some instances when it is not desired to dismantle the whole machine.

By reference to the drawings it will be found that I have succeeded in producing an effective frame-work consisting of but four main parts, lettered A B O D, respectively. The partsA B constitute the keeper of the field-of=force magnets, the magnet-cores a being formed upon them, as shown in Fig. 2. The upper part A is preferably provided with a central strengthening-rib a and is provided with an eye a, by which it can be conveniently lifted off from or replaced upon the part B. Suitable bolts E connect the parts A and B together. The parts 0 and D are substantially duplicates. Each is castin one piece and is provided with strong corners (Z and inclined re-enforces or braces d, which meet at the top, where is located the bearing 61 of the armature-shaft. Each also is provided with Vertical flanged portions (1 which are adapted to fit closely against the adjacent faces of the part B, the said parts 0 B D being firmly secured together by means of suitable bolts applied through the openings (1*, as shown in Fig. 2. Other bolts applied through openings d serve to complete the connection of the parts 0 B .D. The part D, in addition to supporting the armature-shaft, is adapted to support the auxiliarydynamo or exciter G, as shown in Fig. 1, to which end the cores H of the field-of-force magnets are let int-o and secured firmly to it, as shown in Fig. 2, the said-cores in turn supporting the coils g, the adjustable pole-extensions and the bracket (1 which sustains the outer end of the armature-shaft of the said exciter.

As shown in Fig. 1, the parts C and D of the frame are provided with suitable transverse grooves 7t' upon their bottoms; which co operate with ways or guides Z, formed upon or secured to the top of the base L, and in order that the body of the machine may be adjusted forward and backward upon said base a screw-shaft M, having ahandwhecl N, and working through a bearing 0 upon the base, is provided. The end of this screw-shaft works within a threaded aperture in the part B of the frame-work, and by turning the hand-wheel N the body of the machine may be shifted forward or backward with facility. The object of thus shifting the machine on its base is to enable the proper tension'to be given to the driving-belt applied to the pulley P on the armature-shaftwithout changing the base.

A framework constructed in accordance with myinvention, it will be seen, has all the advantages of an integral frame movably mounted on its pedestal, and in addition the advantages incident to a frame so divided as to be easily cast and assembled, and which will permit any section to be removed for repairing without disturbing the remaining sections of the machine.

Having thus described my invention, What I claim as new is 1. In a dynamo-electric machine, the combination, with the keeper-ring having the cores of the field-of-force magnets thereon, of the side sections 0 D, having the heavy corner-pieces and bolted against the sides of the keeper-ring,and also having the journalboxes for the commutation-shaft at the top substantially as described.

2. In a dynamo-electric machine, the combination, witl1 the keeper-ring having the cores of the field-o'f-force magnets thereon and formed by the two segments A and 13,0f the side sections 0 D, having the heavy cornerpieces forming parts of the machine-base bolted against the sides of the bottom segment B, and having journal-boxes for the commutation-shaft at the top, substantially as described.

3. In a dynamo-electric machine, the combination, with the central keeper-ring, of the side pieces bolted thereto and having the heavy corner-pieces constituting the side portions of the base of the machine and bolted to the central keeper-ring to form an integral structure, substantially as described.

4. In a dynamo electric machine, the com-.

bination, with the central keeper-ring, of the side pieces bolted thereto to form an integral structure and having the heavy cornerpieces constituting the side portions of the machine-base of the pedestal or base L, on which the machine is mounted, having ways or guides thereon, and the hand-Wheel and screw for adjusting the machine on the pedestal.

5. In a dynamo-electric machine, the combination, with the keeper-ring, of the side piece bolted thereto, having the journal-box for the armature shaft and the cores for the field-of-force magnets of the auxiliary exciting-machine connected rigidly thereto, Whereby its armature may be driven by the armature-shaft of the main machine, substantially as described.

6. In a dynamo-electric machine, the combination, with the parts A B, constructed as described, of the parts C D, each having the heavy corners d, the inclined braces 01' re-enforces (Z, the bearing (Z for the armatureshait, and the vertical flanges (Z the whole bolted together, substantially as described.

WALTER K. FREEMAN.

Witnesses:

MELVILLE CHURCH, WILLIAM S. HADAWAY, J r. 

